J/ApJ/779/65ivo://CDS.VizieR/J/ApJ/779/65doi:10.26093/cds/vizier.17790065CDSMostardi R.E.Shapley A.E.Nestor D.B.Steidel C.C.Reddy N.A.,Trainor R.F.2018-04-04T05:52:56Z2017-11-27T14:13:32ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxiesphotometryvisible-astronomybroad-band-photometryultraviolet-photometryredshiftedWe present results from a survey for z~2.85 Lyman-continuum (LyC) emission in the HS1549+1933 field and place constraints on the amount of ionizing radiation escaping from star-forming galaxies. Using a custom narrowband filter (NB3420) tuned to wavelengths just below the Lyman limit at z>=2.82, we probe the LyC spectral region of 49 Lyman break galaxies (LBGs) and 91 Ly{alpha} emitters (LAEs) spectroscopically confirmed at z>=2.82. Four LBGs and seven LAEs are detected in NB3420. Using V-band data probing the rest-frame nonionizing UV, we observe that many NB3420-detected galaxies exhibit spatial offsets between their LyC and nonionizing UV emission and are characterized by extremely blue NB3420-V colors, corresponding to low ratios of nonionizing to ionizing radiation (F_UV_/F_LyC_) that are in tension with current stellar population synthesis models. We measure average values of (F_UV_/F_LyC_) for our LBG and LAE samples, correcting for foreground galaxy contamination and H I absorption in the intergalactic medium. We find (F_UV_/F_LyC_)_corr_^LBG^=82+/-45 and (F_UV_/F_LyC_)_corr_^LAE^=7.4+/-3.6. These flux density ratios correspond, respectively, to relative LyC escape fractions of f_esc,rel_^LBG^=5%-8%, and f_esc,rel_^LAE^=18%-49% absolute LyC escape fractions of f_esc,rel_^LBG^=1%-2% and f_esc,rel_^LAE^=5%-15%, and a comoving LyC emissivity from star-forming galaxies of 8.8-15.0x10^24^ erg/s/Hz/Mpc^3^. In order to study the differential properties of galaxies with and without LyC detections, we analyze narrowband Ly{alpha} imaging and rest-frame near-infrared imaging, finding that while LAEs with LyC detections have lower Ly{alpha} equivalent widths on average, there is no substantial difference in the rest-frame near-infrared colors of LBGs or LAEs with and without LyC detections. These preliminary results are consistent with an orientation-dependent model where LyC emission escapes through cleared paths in a patchy interstellar medium.2013ApJ...779...65Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/779/65CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/498/13 : Lyman-{alpha} emitters from redshifts z~2-3 (Nilsson+, 2009)J/ApJ/736/18 : Lyman-continuum emission at z~3 in SSA22 field (Nestor+, 2011)J/ApJ/744/110 : LAE galaxies between 2.1=<z<=3.1 (Ciardullo+, 2012)J/ApJ/765/47 : Lyman-break galaxies and LAEs at z~3 (Nestor+, 2013)J/A+A/563/A142 : UGR photometry of LBG candidates at z~3 (Boutsia+, 2014)J/ApJ/810/107 : Lyman break galaxies and LAEs HST photometry (Mostardi+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/779/65https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/779/65http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/779/65https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/779/65https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/779/65http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/779/65GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/779/65/table4 (LAE Photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/779/65/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/779/65/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/779/65/table4?GETtext/xml+votable180.050000true237.9112166719.1680250.005555555555555556Cone search capability for table J/ApJ/779/65/table3 (LBG Photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/779/65/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/779/65/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/779/65/table3?GETtext/xml+votable180.050000true237.9737333319.206844440.005555555555555556Cone search capability for table J/ApJ/779/65/table8 (Photometry for GNBs and LAEs with m_4670_>26.0)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/779/65/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/779/65/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/779/65/table8?GETtext/xml+votable180.050000true237.9733458319.193480560.005555555555555556Cone search capability for table J/ApJ/779/65/table9 (Photometry for LAE Photometric Candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/779/65/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/779/65/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/779/65/table9?GETtext/xml+votable180.050000true237.9209958319.166002780.0055555555555555566/8552 8553https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/779/65?format=asciiOpticalUVdefaultJ/ApJ/779/65/table4LAE PhotometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlae[32/7893]? LAE identifier (laeNNNN) (not in table3)meta.idintnullablen_lae[efghijklm] Note on lae (2)meta.notecharRAJ2000Hour of Right Ascension (J2000) (3)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (3)pos.eq.dec;meta.mainz? Redshiftsrc.redshiftfloatnullableNB4670mag? KeckI/LRIS-B NB4670 AB magnitudemagphot.mag;em.optfloatnullablel_Vmag[>] Limit flag on Vmagmeta.code.errorcharVmagKeckI/LRIS-R V-band AB magnitudemagphot.mag;em.opt.Vfloatl_NB3420mag[>] Limit flag on NB3420magmeta.code.errorcharNB3420magKeckI/LRIS-B NB3420 AB magnitudemagphot.mag;em.UVfloatDelUV? Spatial offset between the centroid of V-band and NB3420 emission, {Delta}_UV,LyC_arcsecpos.angDistancefloatnullableDelLy? Spatial offset between the centroid of NB4760 and NB3420 emission, {Delta}_Ly{alpha},LyC_arcsecpos.angDistancefloatnullablel_FUV/FLyC[>] Limit flag on FUV/FLyCmeta.code.errorcharFUV/FLyC? Observed ratio of nonionizing UV to LyC flux-densities, inferred from the NB3420-V color (4)phot.flux;arith.ratiofloatnullablee_FUV/FLyC? Uncertainty in FUV/FLyCstat.errorfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/779/65/table3LBG PhotometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLBGLBG identifier (only in table3) (1)meta.id;meta.maincharn_lae[efghijklm] Note on lae (2)meta.notecharRAJ2000Hour of Right Ascension (J2000) (3)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (3)pos.eq.dec;meta.mainz(em)? Emission redshift of Ly{alpha}src.redshiftfloatnullablez(abs)? Interstellar absorption redshiftsrc.redshiftfloatnullableVmagKeckI/LRIS-R V-band AB magnitudemagphot.mag;em.opt.Vfloatl_NB3420mag[>] Limit flag on NB3420magmeta.code.errorcharNB3420magKeckI/LRIS-B NB3420 AB magnitudemagphot.mag;em.UVfloatDelUV? Spatial offset between the centroid of V-band and NB3420 emission, {Delta}_UV,LyC_arcsecpos.angDistancefloatnullablel_FUV/FLyC[>] Limit flag on FUV/FLyCmeta.code.errorcharFUV/FLyC? Observed ratio of nonionizing UV to LyC flux-densities, inferred from the NB3420-V color (4)phot.flux;arith.ratiofloatnullablee_FUV/FLyC? Uncertainty in FUV/FLyCstat.errorfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/779/65/table8Photometry for GNBs and LAEs with m_4670_>26.0SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlae[32/7893]? LAE identifier (laeNNNN) (not in table3)meta.idintnullableGNB[2861/5270]? GNB (G narrowband filter (NB4670) selected LAE) identifier (GNBNNNN) (only in table8)meta.idintnullableRAJ2000Hour of Right Ascension (J2000) (3)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (3)pos.eq.dec;meta.mainz? Redshiftsrc.redshiftfloatnullableNB4670mag? KeckI/LRIS-B NB4670 AB magnitudemagphot.mag;em.optfloatnullableVmagKeckI/LRIS-R V-band AB magnitudemagphot.mag;em.opt.VfloatNB3420magKeckI/LRIS-B NB3420 AB magnitudemagphot.mag;em.UVfloatDelUV? Spatial offset between the centroid of V-band and NB3420 emission, {Delta}_UV,LyC_arcsecpos.angDistancefloatnullableDelLy? Spatial offset between the centroid of NB4760 and NB3420 emission, {Delta}_Ly{alpha},LyC_arcsecpos.angDistancefloatnullableFUV/FLyC? Observed ratio of nonionizing UV to LyC flux-densities, inferred from the NB3420-V color (4)phot.flux;arith.ratiofloatnullablee_FUV/FLyC? Uncertainty in FUV/FLyCstat.errorfloatnullableJ/ApJ/779/65/table9Photometry for LAE Photometric CandidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlae[32/7893]? LAE identifier (laeNNNN) (not in table3)meta.idintnullableRAJ2000Hour of Right Ascension (J2000) (3)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (3)pos.eq.dec;meta.mainNB4670mag? KeckI/LRIS-B NB4670 AB magnitudemagphot.mag;em.optfloatnullablel_Vmag[>] Limit flag on Vmagmeta.code.errorcharVmagKeckI/LRIS-R V-band AB magnitudemagphot.mag;em.opt.Vfloatl_NB3420mag[>] Limit flag on NB3420magmeta.code.errorcharNB3420magKeckI/LRIS-B NB3420 AB magnitudemagphot.mag;em.UVfloatDelUV? Spatial offset between the centroid of V-band and NB3420 emission, {Delta}_UV,LyC_arcsecpos.angDistancefloatnullableDelLy? Spatial offset between the centroid of NB4760 and NB3420 emission, {Delta}_Ly{alpha},LyC_arcsecpos.angDistancefloatnullablel_FUV/FLyC[>] Limit flag on FUV/FLyCmeta.code.errorcharFUV/FLyC? Observed ratio of nonionizing UV to LyC flux-densities, inferred from the NB3420-V color (4)phot.flux;arith.ratiofloatnullablee_FUV/FLyC? Uncertainty in FUV/FLyCstat.errorfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar